JP2003138192A - Water-based ink for writing board - Google Patents

Abstract

(57) [SUMMARY] [PROBLEMS] To write on a non-permeable writing surface, and the handwriting does not easily peel off by rubbing, but with a wet wipe such as a wet cloth, wet tissue, or wet blackboard wipe. To provide a water-based ink for a writing board that can be easily erased. SOLUTION: An acrylic resin emulsion comprising 5 to 30% by weight of an organic or inorganic pigment, 5 to 15% by weight of aluminum silicate, and a polymer of acrylate ester or a copolymer of acrylate ester and styrene. 2-7% by weight in terms of solid content, polyethylene wax emulsion 2-7% by weight in terms of solid content, and at least water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based ink for writing boards, and more particularly to writing of non-penetrable resin plates, metal plates, enamel plates, glass plates, baking coated plates, films and the like. The present invention relates to a water-based ink for a writing plate that can be written on a surface and that can be easily erased with a wet wipe such as a wet cloth, a wet tissue, or a wet blackboard wipe. Incidentally, the writing plate ink in the present invention means an ink which can be written on a non-permeable writing surface such as the resin plate, the metal plate, the enamel plate, the glass plate, the baking coating plate, the film, or the so-called white board. It does not mean an ink used only for such things.

[0002]

2. Description of the Related Art Heretofore, there have been known many water-based ink compositions for writing boards, which are capable of erasing handwriting written on a non-absorbing surface. These water-based ink compositions for writing plates are disclosed, for example, in JP-A-3-62863, JP-A-4-239569, JP-A-6-122849, and the like, a pigment, a resin, and a release agent. It consists of

[0003]

However, the above-mentioned conventional water-based ink for writing boards is capable of erasing handwriting on a writing surface which is non-permeable, but on the other hand, it contains a release agent. However, there is a problem that the hand and clothes are stained because it is easily erased by touching the handwriting and the handwriting becomes unreadable. It is an object of the present invention to provide a water-based ink for a writing plate, which does not peel off when simply rubbed and is easily erasable when erasing is attempted.

[0004]

DISCLOSURE OF THE INVENTION The gist of the present invention is an aqueous ink for a writing board containing at least a pigment, aluminum silicate, an acrylic resin emulsion, a polyethylene wax emulsion, and water.

Each component of the present invention will be described in detail below. The pigment is used as a colorant, and conventionally known organic pigments such as azo pigments, condensed polyazo pigments, phthalocyanine pigments, quinacridone pigments, indigo pigments, thioindigo pigments and the like, carbon black, navy blue, and red iron oxide. , Inorganic pigments such as titanium oxide and aluminum powder, metal powder pigments such as brass powder, and these pigments,
Among fluorescent pigments, pearl pigments and the like, one or two or more kinds that can be stably dispersed as fine particles in the water-based ink for a writing plate can be appropriately selected and used. Although the amount used varies depending on the type of pigment and other ink components, it is 1 to 40% by weight based on the total amount of the water-based ink for writing board,
It is preferably 5 to 30% by weight.

Aluminum silicate imparts hiding power in the aqueous pigment dispersion, but when used together with the pigment, the hiding power can be improved as compared with the case where the pigment alone is used. It is used as an auxiliary agent and a matte material that makes it easier to see written characters from a distance. The amount used is 1 to 20% by weight, preferably 5 to 15% by weight, based on the total amount of the water-based ink for writing boards.
Is.

The acrylic resin emulsion is used for the purpose of dispersing the pigment and providing a coating film.
Although it can be used without particular limitation, an emulsion of a polymer of acrylic acid ester or a copolymer of acrylic acid ester and styrene is preferably used. In particular,
As a polymer of acrylic acid ester, Primal AC-
22, the same AC-261, the same AC-73, the same AC-344
4, AC-2235 (above, manufactured by Rohm and Haas Japan Co., Ltd.), JSR acrylic emulsion A
E322, 517, 513A, 815 (Nippon Synthetic Rubber Co., Ltd.), Movinyl 700, 710,
727, 744, 745, 747, 930,
931, DM772, DM774 (above, manufactured by Hoechst Synthesis Co., Ltd.) and the like. Examples of emulsions of copolymers of acrylic ester and styrene include movinyl 707, 728, 860, 861, and 93.
3, 946, and DM60 (above, Hoechst Synthetic Co., Ltd.)
Manufactured), Nicazole RX-291, the same RX-383, the same R
X-284A, RX-533K, RX-78B, RX-568 (all manufactured by Nippon Carbide Industry Co., Ltd.),
Examples include John Krill 61J, the same 62, the same 450, and the same 501 (all manufactured by Johnson Co., Ltd.). These acrylic resin emulsions can be used alone or in combination of two or more. The amount of these acrylic resin emulsions used is 1 to 10% by weight, preferably 2 to 7% by weight, based on the total amount of the water-based ink for writing boards, as the solid content of the acrylic resin emulsion.

The polyethylene wax emulsion is a dispersion of an ethylene low polymer in water using a surface active agent such as a nonionic surface active agent or an anionic surface active agent. The ethylene low polymer can be obtained by three kinds of production methods including polymerization of ethylene, decomposition of high molecular weight polyethylene, and separation of low polymer produced as a by-product during production of high molecular weight polyethylene. The polyethylene in the polyethylene wax emulsion preferably has a molecular weight of 500 to 10,000. Polyethylene wax emulsion
It is used for the purpose of improving the ability of handwriting to form a coating film and the erasability, and can be used without particular limitation. Specifically, Polyem 20, 40J (above, manufactured by Rohm and Haas Japan Co., Ltd.), Hitec E-600.
0, E-7058, E-4A, E-4B, E-
100, E-103N, E-68A (all manufactured by Toho Chemical Industry Co., Ltd.), John Wax JW-24, JW
-554 (above, manufactured by Johnson Co., Ltd.) and the like. The amount of these polyethylene wax emulsions used is 1 to 10% by weight, preferably 2 to 7% by weight, based on the total amount of the aqueous ink for writing boards, as the solid content in the polyethylene wax emulsion.

Further, in the water-based ink for a writing board according to the present invention, it is possible to use a lower alcohol as a drying accelerator which enhances the drying property of handwriting. Examples of the lower alcohol include ethanol, normal propanol, isopropyl alcohol, normal butyl alcohol, isobutyl alcohol and the like. The amount of the lower alcohol used must be such that the emulsion contained in the ink is not destroyed, and is 1 to 15 parts by weight, preferably 2 to 10 parts by weight.

In addition to the components shown above, p may be added if necessary.
H additives, antiseptics, antifungal agents, wetting agents, viscosity modifiers, antifreezing agents, nib dry inhibitors, antifoaming agents, various solvents, etc. You can

The method for producing a water-based ink for a writing board of the present invention comprises mixing a required amount of each of the above-mentioned components with a homomixer,
It can be easily obtained by mixing and dispersing with a high speed stirrer such as a lab mixer or a disperser such as a ball mill, a sand mill or a bead mill.

[0012]

The aqueous ink for writing boards of the present invention comprises a film formed by mixing an acrylic resin emulsion and a polyethylene wax emulsion. Since the acrylic resin alone has good fixability on the writing surface, peeling does not occur just after rubbing, and by using a polyethylene wax emulsion together, the emulsifier in the coating film and the polyethylene wax reduce water resistance, The handwriting can be erased by wiping with a wet item.

[0013]

EXAMPLES The present invention will be described in more detail below with reference to examples. The above components were stirred in a ball mill for 12 hours to obtain a water-based ink for writing plates.

Example 2 C. I Pigment Red 170 2.0 parts by weight C.I. I Pigment White 6 13.0 parts by weight C.I. I Pigment White 19 11.0 parts by weight Movinyl 727 10.0 parts by weight John Wax JW-554 10.0 parts by weight Propylene glycol 4.0 parts by weight Isopropyl alcohol 4.0 parts by weight Proxel GXL (S) 0.3 parts by weight Water 45.7 parts by weight The above components were stirred in a ball mill for 24 hours to obtain a water-based ink for writing plates.

Example 3 C. I pigment blue 15: 6 1.0 part by weight C.I. I Pigment White 6 14.0 parts by weight C.I. I Pigment White 19 10.0 parts by weight John Cryl 61J 8.0 parts by weight Hitec E-68A 8.0 parts by weight Glycerin 7.0 parts by weight Ethyl alcohol 3.0 parts by weight Normal butyl alcohol 2.0 parts by weight Proxel GXL ( S) (previously described) 0.2 parts by weight water 46.8 parts by weight The above components were dispersed in a ball mill for 48 hours to obtain a water-based ink for writing plates.

Example 4 C. I Pigment Green 7 1.0 parts by weight C.I. I Pigment White 6 13.0 parts by weight C.I. I Pigment White 19 11.0 parts by weight Nicazole RX-638A 6.0 parts by weight Polyem 40J 6.0 parts by weight Glycerin 7.0 parts by weight Ethyl alcohol 3.0 parts by weight Normal propyl alcohol 3.0 parts by weight Proxel GXL (S ) (Previously described) 0.2 parts by weight water 49.7 parts by weight The above components were dispersed in a ball mill for 48 hours to obtain an aqueous ink for a writing board.

Example 5 C. I Pigment Orange 13 2.0 parts by weight C.I. I Pigment White 6 14.0 parts by weight C.I. I Pigment White 19 9.0 parts by weight Movinyl 728 10.0 parts by weight Hitec E-4A 5.0 parts by weight Glycerin 7.0 parts by weight Ethyl alcohol 3.0 parts by weight Proxel GXL (S) (above) 0.2 parts by weight Part water 49.8 parts by weight The above components were dispersed in a ball mill for 12 hours to obtain a water-based ink for writing plates.

Example 6 C. I Pigment Yellow 12 2.0 parts by weight C.I. I Pigment White 6 13.0 parts by weight C.I. I Pigment White 19 10.0 parts by weight Primal AC-3444 6.0 parts by weight Polyem 20 7.0 parts by weight Ethylene glycol 5.0 parts by weight Ethyl alcohol 3.0 parts by weight Isopropyl alcohol 2.0 parts by weight Proxel GXL (S ) (Previously described) 0.2 parts by weight water 51.8 parts by weight The above components were dispersed in a ball mill for 24 hours to obtain a water-based ink for writing plates.

Example 7 C. I pigment violet 23 0.5 parts by weight C.I. I Pigment White 6 15.0 parts by weight C.I. I Pigment White 19 8.0 parts by weight Movinyl 705 7.0 parts by weight John Wax JW-24 12.0 parts by weight Glycerin 7.0 parts by weight Ethyl alcohol 3.0 parts by weight Proxel GXL (S) 0.2 parts by weight water 47.3 parts by weight The above components were dispersed in a ball mill for 48 hours to obtain a water-based ink for writing plates.

Example 8 C. I Pigment White 6 15.0 parts by weight C.I. I Pigment White 19 12.0 parts by weight John Cryl 450 8.0 parts by weight Hi-Tech E-7058 8.0 parts by weight Propylene glycol 7.0 parts by weight Ethyl alcohol 8.0 parts by weight Isopropyl alcohol 2.0 parts by weight Proxel GXL ( S) (previously described) 0.2 parts by weight water 33.8 parts by weight The above components were dispersed in a ball mill for 12 hours to obtain a water-based ink for writing plates.

Comparative Example 1 An aqueous ink for a writing board was obtained in the same manner as in Example 1 except that Hitec E-1000 was changed to Primal AC-261.

Comparative Example 2 In Example 3, John Krill 61J and Hi-Tech E
-68A was changed to 8 parts by weight of polyvinyl alcohol, and dimethylsiloxane-polyether copolymer 5 was used as a release agent.
A water-based ink for a writing plate was obtained in the same manner as in Example 3 except that 100 parts by weight of water and 100 parts by weight of water were added.

Comparative Example 3 An aqueous ink for a writing board was obtained in the same manner as in Example 5, except that Hitec E-4A was replaced with water.

Comparative Example 4 In Example 8, John Krill 450 and Hi-Tech E
A water-based ink for a writing board was obtained in the same manner as in Example 8 except that 2 parts by weight of polyoxyethylene nonylphenyl ether was replaced with 100 parts by weight of water.

The water-based ink for writing plates obtained in Examples 1 to 8 and Comparative Examples 1 to 4 described above was directly filled in an ink containing portion in which a stainless steel ball for agitation was placed to form an ink containing portion and a pen tip. The valve mechanism arranged between the two is opened by the knock of the pen tip, and the ink is discharged to the pen tip to fill the raw ink type writing instrument of the type that enables writing to create a test sample for writing, and the writing test And an erasability test was conducted. The results are shown in Table 1.

[0026]

[Table 1]

* 1 Fixing test Write a 5 × 5 cm square line on a enamel whiteboard and melamine resin whiteboard, and after 10 minutes, rub the handwriting with your finger up to 10 times and measure the number of times until the handwriting disappears. did. > 10:10 rubbing does not change handwriting

* 2 Erasability test Write a 5 × 5 cm square line on a white board made of enamel and a white board made of melamine resin, and after 10 minutes, wipe the handwriting up to 10 times with a wet cloth until the handwriting disappears. Was measured. > 10:10 Do not wipe the handwriting even if wiped

[0029]

INDUSTRIAL APPLICABILITY As described above, the water-based ink for writing plates of the present invention can be written on a non-penetrative writing surface, and its handwriting can be wet wipes, wet tissues, wet wipes such as wet blackboard wipes. It is excellent for erasing by.

Claims (3)

[Claims] 1. A water-based ink for a writing board, which contains at least a pigment, aluminum silicate, an acrylic resin emulsion, a polyethylene wax emulsion, and water. 2. The water-based ink composition for a writing board according to claim 1, wherein the acrylic resin emulsion is an emulsion of a polymer of acrylic acid ester or a copolymer of acrylic acid ester and styrene. 3. A polyethylene wax emulsion,
The water-based ink composition for a writing plate according to claim 1 or 2, which is an emulsion of polyethylene having a molecular weight of 500 to 10,000.